package server.autorization.filters;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


@WebFilter("/Authentication")
public class Authentication implements Filter {
	private static final String HTML = ".html";
	private static final String SERVLET = "Servlet";
	private static final String LOGIN_PAGE = "LoginPage.html";

    
    public Authentication() {
        
    }

	
	public void destroy() {
		
	}

	
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		
		String url = req.getRequestURI();		
		HttpSession session = req.getSession(false);		
		if(session == null && !(url.endsWith(HTML) || url.endsWith(SERVLET))){
		
			res.sendRedirect(LOGIN_PAGE);
					
		}else{			
			chain.doFilter(request, response);
		}	
	}

	
	public void init(FilterConfig fConfig) throws ServletException {
		
	}

}
